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Does the NLB needs a file witness share ?
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Does the NLB needs a file witness share ?

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no.. you only need a witness share when you are deciding to implement CCR and that only protects a Mailbox server role
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no.. you only need a witness share when you are deciding to implement CCR and that only protects a Mailbox server role

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Here is a good article I found.<br />
<a href="http://www.msexchange.org/articles_tutorials/exchange-server-2007/high-availability-recovery/load-balancing-exchange-2007-client-access-servers-windows-network-technology-part1.html" rel="ugc">http://www.msexchange.org/articles_tutorials/exchange-server-2007/high-availability-recovery/load-balancing-exchange-2007-client-access-servers-windows-network-technology-part1.html</a>
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Here is a good article I found.
http://www.msexchange.org/articles_tutorials/exchange-server-2007/high-availability-recovery/load-balancing-exchange-2007-client-access-servers-windows-network-technology-part1.html [http://www.msexchange.org/articles_tutorials/exchange-server-2007/high-availability-recovery/load-balancing-exchange-2007-client-access-servers-windows-network-technology-part1.html]

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I have an Exhange 2007 2 node CCR with one CAS HUB Transport server.I need to setup a 2nd CAS HUB Transport Server for redundancy and high availability.<br />
With Client Access--You can use NLB or a third-party hardware-based NLB device for Client Access server high availability. Does the NLB or DNS &nbsp;round robin have to be on the same subnet ? <br />
How would you setup the Exchange Exchange CAS Server NLB or DNS round robin, what are the pros and cons?
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I have an Exhange 2007 2 node CCR with one CAS HUB Transport server.I need to setup a 2nd CAS HUB Transport Server for redundancy and high availability.
With Client Access--You can use NLB or a third-party hardware-based NLB device for Client Access server high availability. Does the NLB or DNS  round robin have to be on the same subnet ? 
How would you setup the Exchange Exchange CAS Server NLB or DNS round robin, what are the pros and cons?

Exchange 2007 CAS server redundancy and high availability.

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).